/Engine/Source/Runtime/Core/Public/Serialization/PackageWriter.h
Append all data to the Exports archive that would normally be done in CommitPackage, used for diffing.
virtual void CompleteExportsArchiveForDiff ( [FPackageInfo](API\Runtime\Core\Serialization\IPackageWriter\FPackageInfo) & Info, [FLargeMemoryWriter](API\Runtime\Core\Serialization\FLargeMemoryWriter) & ExportsArchive )